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Homework Help: Fluid Questions. Help please

  1. Nov 22, 2009 #1
    1. The problem statement, all variables and given/known data
    The main water line enters a house on the first floor. The line has a gauge pressure of 1.90 multiplied by 105 Pa.
    (a) A faucet on the second floor, 6.3 m above the first floor, is turned off. What is the gauge pressure at this faucet?
    (b) How high could a faucet be before no water would flow from it, even if the faucet were open?

    2. Relevant equations
    density= m/v
    Fbuoyancy= (density)Vg
    P + (1/2)(density)(v)^2 + (density)gh = constant
    P= (density)gh

    3. The attempt at a solution
    P= 1000(9.8)(6.3) = 61740? not right. i'm not sure what else to do.
  2. jcsd
  3. Nov 24, 2009 #2
    Anyone? It's due tonight so if someone could give me a couple of tips that would be great. thanks in advance
  4. Nov 24, 2009 #3


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    Homework Helper

    1. (a) It's 61740 Pa below the gauge pressure on the lower floor, since the pressure applied by the 6.3 m water column is part of the water pressure felt on the first floor. Are you sure the line's gauge pressure is 1.90*105 Pa and not 1.90*105 kPa?

    (b) What's the minimum water pressure necessary to force water out?
  5. Nov 24, 2009 #4
    Yeah actually the pressure is 1.9 x10^5 Pa not 1.9 x 105 Pa. I accidentally typed it wrong onto the computer
  6. Nov 24, 2009 #5
    ok I figured it out. Thank you so much ideasrule for your help.
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